198 north from Three Rivers, CA all the way to the intersection of Highway 180 is a great ride. The largest living tree by volume, the General Sherman Tree [see http://en.wikipedia.org/wiki/General_Sherman_(tree) ] is along this route, as well as more than a dozen Giant Sequioas easily visible by roadside. The Moro Rock is beautiful and there are a number of campgrounds the fill up in the summer, so make reservations early. There are a tremendous amount of tight turns but the speed limit is very low and there is a lot of vehicle traffic. Lots of tourists and not a lot of people paying attention to the roadway, so be cautious. Also, in the area of the giant trees, a lot of people park on the roadway or shoulder to take pictures. Again, exercise caution. That said, is it worth it? ABSOLUTELY!
follow the 180 from Squaw valley, then turn onto the General's Highway that twists wildy around Moro Rock and into Hammond and down to Three Rivers, if you're a hairpin addict, you'll love it.